I thought crankcase pressure was also cool with pipes. You learn something new every day! Well, some days anyhow.
Here is something I found on the topic:
Ed Smith -> RE: High Speed Turn Lean-out on Viper (9/20/2004 12:07 AM)
Dave,
Two things. None of our racing engines, Q500, Q40 or F3d with tuned pipes use crankcase pressure. So that should tell you something.
I started off F3D with crankcase pressure and thought I was doing OK. Then I went to pipe pressure. the difference was truly amazing. With CCP I was forever fiddling with the needle and pinching the line at the same time to get the engine to the first stage. With pipe pressure, assuming everything else was set up correctly, the engine needled up to full tune with no effort. The engine started, needled to the first stage, needled up to where it jumped on the pipe and final setting.
I can only guess it has something to do with CCP being pulsed by the piston stroke while Pipe Pressure is smoother and constant.
Ed S
I then end up wondering if the pressure tap orifice diameter would play a role in the smoothness/consistency. Anyhow.. if pipe pressure is enough to feed a F3D or Q40 engine then there you go.
Not sure this is all that high timed of an engine - with HP rating given at 19k for the RC aero version I suspect it is like my "Speed" .15 RCA (R/C Aero) - peppy but not radical. SRV, break out the degree wheel..